Orthogonal pulsars as a key test for pulsar evolution

At present, there is no direct information about the evolution of inclination angle $χ$ between magnetic and rotational axes in radio pulsars. As to theoretical models of pulsar evolution, they predict both the alignment, i.e. evolution of inclination angle $χ$ to $0^{\circ}$, and its counter-alignment, i.e. evolution to $90^{\circ}$. In this paper, we demonstrate that the statistics of interpulse pulsars can give us the key test to solve the alignment/counter-alignment problem as the number of orthogonal interpulse pulsars ($χ\approx 90^{\circ}$) drastically depends on the evolutionary trajectory.

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